Nozzle for elastic-fluid turbines.



G. E. STEVENS.

NOZZLE FOR ELASTIC FLUID TURBINE-S.

AiPLIGATION FILED AUGA, 1908.

951,346, Patented Mar. 8 1910.

Geoe E. S bevemsg 1 parallel sides 4 and diverging edges 5.

' To all whom it may concern:

om'rnn sra'r ns AENT nsrcn.

GEORGE E. STEVENS, or LYNN, MAssAoHUsnTrs. .ASSIGNOR T0 GENERAL ELECTRICCOMPANY, A CORPORATION or NEW YORK.

NOZZLE FOR ETQASTIOFLUIID TURBINES.

Specification of Letters Patent.

Application filed August. 4, 1908. Serial No. 446,841.

c itknown a citizen of the Lynn, county setts, have invented certain newand useful that I, Gnonon E.

lmpr n'ements in Nozzles for Elastic-Fluid.

Turbines, of which the following a specification.

This invention relates to nozzles such as are used in elastic fluidturbines to discharge the motive fluid. against the wheel buckets.

The OlJJOCt of the invention is to simplify the construction of suchnozzles, reduce the cost of manufacture, insure accuracy in shape'andsmoothness and hardness of the surfaces over which the elastic fluidpasses, and secure exact uniformity and Srnvnxs, United States, residingat l of Essex, State of Massachuinterchangenbility where the nozzles aremade in 1 large quantities. I

My improved nozzle is made of sheet metal, and is composed of twocompLmentary parts or sections meeting on longitudinal lines, preferablya median plane. Each part section or half is therefore an open troughwhich can be easily struck up in dies, thereby insuring accuracy inshape, smoothness of surface, a hard-skin on the metal, and exactsimilarity between large numbers of nozzles. by joining their meetingedges in any suitable manner, preferably by The sections are unitedfusing or burning them together by an oxygen-acetylene a turbine, andalso making repairs, inasmuch Close toa similar View of I the oppositeedge and Fig. 6 is a sectional F A I I flame of high temperature, suchas an acetyside elevation showing the nozzle inserted in its supportingplate.

he receiving end of the uozzleconsists of a bowl 1 preferably circularin cross section i in a plane of reyolution with reference to the axisof the turbine shaft. said mouth, as shown in F g.

The sides of 5, are curved wherein there is an to the same arcs as thetips buckets, while the ends of preferably radial, so that zles may begrouped edge to edge. This a number of nozinsures that-the fluidissuing'from said group forms a practicallyv solid or undivided column,and the curve .of the side walls causes the tuna to be delivered to thebuckets.

This nozzle is composed of two complementary parts or sections 7, 8united along longitudinal lines, preferably a median plane, so that thesections are similar halves. lilaeh half of the nozzle forms a trough,as shown in Figs. 1, 2 and 3, which can be easily madeby striking up orpressing a suitable blank between dies. After the parts of thenozzle arepressed or struck up there will usually be a certain amount of excessmetal at or about the edges which are to be united. lVhen such is thecase the said Patented Mar. 8, 1910.

and bases of the said month areand fit snugly together,.

whole of said 001- milled or otherwise machined and then united. handedand left-handed, two corresponding setsof dies are necessary. The use ofdies insures exact similarity in all the sections, so that any pair ofsections will fit: together, and the nozzle made therefrom will be cX-actly the same, as all others made from sections struck by the samedies. This is of importance in facilitating the assembling of as adefective nozzle can be replaced by a new one with entire assurancethatno alterations will be required. I

The two complementary sections 7, 8 may be united in any suitablemanner. but preferably by placing their edges 9 in contact and weldingor burning them together by a lene jet. After being united they are cutoff obliquely to form the mouth of-the noz-- zle. 'The'curving of thesides of the mouth may be done either by the dies which-form thesections, or by a separate operation after the nozzle has been cutobliquely. The dies give not only accuracy of shape, but a smoothsurface affording no obstruction to the flow of the elastic fluid, and ahard skin to the metal which increases the durability 10a of the nozzle.

I have illustrated an expanding nozzle increase in cr0ss-sec- As thesections 7, 8 are right-- tional area between the throat and thedischarge end, but the invention is not so limited as it applies also tostraight-bored and converging nozzles.

One very decided advantage attained by i using my invention resides inthe fact that there is practically no waste material, the

with the apparatus Which I now consider to I represent the bestembodiment thereof; but I desire to have it understood that theapparatus shown is only illustrative, and that the invention can becarried out by other means.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is,

\ 1. As a new article of manufacture, a nozi -zle tor elastic fluidturblnes composed of two sheet metal trough-shaped complementary 1sections meeting along longitudinal lines.

2. As a new article of manufacture, a nozzle for elastic fluid turbinescomposed of two i struck-up sheet metal sections united along 2 a medianplane.

; As a new article of manufacture, a nozzle for elastic fluid turbinescomposed of similar sheet metal halves united along their meeting edges.

4. As a new article of manufacture, a nozzle for elastic fluid turbinescomposed of complementary sections each comprising part of the bowl andbody portion.

5. As a new article of manufacture, a nozzle for elastic fluid turbinescomposed of sheet metal sections each comprising a half of the bowl andbody portion.

.ln witness whereof, I have hereunto set my hand this first day ofAugust, 1908.

GEO. l). STEVENS.

(itnesses Jonn A. McMAnUs, Jr., 1 ROBERT SHAixo.

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